feat(example): clean up for android

example/lib/utils/app_snack_bar.dart

@@ -0,0 +1,31 @@
+import 'package:flutter/material.dart';
+
+class AppSnackBar {
+  AppSnackBar._();
+
+  static Future<void> show(
+    BuildContext context, {
+    required String title,
+    String? subtitle,
+    String? actionName,
+    VoidCallback? onAcceptAction,
+  }) async {
+    final content = Column(
+      mainAxisSize: MainAxisSize.min,
+      children: [
+        Text(title, style: const TextStyle(fontSize: 16)),
+        if (subtitle != null) Text(subtitle),
+      ],
+    );
+    final action = onAcceptAction != null && actionName != null
+        ? SnackBarAction(label: actionName, onPressed: onAcceptAction)
+        : null;
+    final messenger = ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(
+        content: content,
+        action: action,
+      ),
+    );
+    return messenger.closed.then((value) => null);
+  }
+}

example/lib/utils/file_saver.dart

@@ -0,0 +1,26 @@
+import 'dart:io';
+
+import 'package:nearby_service/nearby_service.dart';
+import 'package:path_provider/path_provider.dart';
+
+class FilesSaver {
+  FilesSaver._();
+
+  static Future<bool> savePack(
+    ReceivedNearbyFilesPack pack,
+  ) async {
+    final directory = Platform.isAndroid
+        ? Directory('storage/emulated/0/Download')
+        : await getApplicationDocumentsDirectory();
+
+    for (final nearbyFile in pack.files) {
+      final newFile = await File(nearbyFile.path).copy(
+        '${directory.path}/${DateTime.now().microsecondsSinceEpoch}.${nearbyFile.extension}',
+      );
+      if (!await newFile.exists()) {
+        await newFile.create();
+      }
+    }
+    return true;
+  }
+}